Arsene Wenger conceded that Arsenal have lost momentum and look destined for a frustrating second-placed finish in their Champions League group, after being held to a 2-2 draw against Paris Saint-Germain.
Edinson Cavani gave the visitors the lead, slotting home a Blaise Matuidi's low cross from close range, but Olivier Giroud levelled from the penalty spot on the stroke of half-time after Grzegorz Krychowiak fouled Alexis Sanchez in the box.
But Lucas's 77th-minute header was deflected into his own net by Gunners winger Alex Iwobi and Arsenal were unable to find a victor.
Arsenal were feeling all three points were already in the bag until Iwobi nicks Lucas Moura's header past David Ospina and into the net in the 77 minute. The intensity we put in and the result.
"We have not lost but we have lost winning momentum a little bit", Wenger said.
Arsène Wenger (Arsenal coach): "I think that we brought some real intensity to this match".
'I felt we could have been a lot better technically and more unsafe.
"Middlesbrough should have beaten them at the Emirates, they were 1-1 with about 20 minutes to go with Sunderland - who were rock bottom of the table and couldn't win a game for toffee - and got three late goals, then there was last weekend's game against Manchester United".
"We had a very strong start in the second half, we were dominant".
City drew 1-1 at Borussia Moenchengladbach and can not now topple Barcelona, which secured first place in Group C by beating Celtic 2-0 thanks to Lionel Messi's double.
Arsenal's inability to top their Champions League group has cost them dearly as they have failed to get past the last 16 in the past six years - and they now face the same fate again.
Former Arsenal forward Paul Merson says Arsene Wenger's class of 2016-17 are "covering over the cracks", despite being unbeaten since the opening day of the season.
"At the moment we are second, but it's not over", offered Wenger, optimistically. But that is part of the game.
"We did a good job putting pressure on a team that likes to have the ball. We have the players and the quality, it's about how we impose that on the game". But the start of the game was in favour of Paris Saint-Germain because I think we let them play too comfortably.
It is very unlikely that PSG are going to drop points to Ludogorets - who have not won a single game in the group - and it seems nearly a certainty that Arsenal will now finish second in their group.
PSG remain top of Group A after the draw but Unai Emery believes his side have not secured top spot just yet. "It was important not to lose and that's what we managed not to do". "But we have another match to go to try and finish first in the group". The team deserved the draw, deserves to be first. "Analyse the two games against Arsenal and we do deserve it".